What should a dealer check before buying a TUDOR M7941A1A0NU-0001?

Check the T-fit clasp actually adjusts. It is the headline convenience of this generation, and a clasp that has been forced or badly serviced is an expensive part to put right. Read the bezel action. TUDOR states it is deliberately harder to turn at the 12 o'clock position to prevent inadvertent rotation — a bezel that spins freely there has been apart. Confirm the calibre against the reference. MT5602-U is the Master Chronometer version; earlier Black Bay generations use different movements, and the caseback and papers should agree with what is inside. Measure the thickness if the seller describes it as slim. At 13.6mm this is not a thin watch, and a description that suggests otherwise is a signal about the rest of the listing. Check the lug width before buying straps for it. 21mm is an awkward size and a common source of post-sale complaints.

What size is the TUDOR M7941A1A0NU-0001?

TUDOR publishes reference M7941A1A0NU-0001, the Black Bay, as 41 mm in diameter, 13.6 mm thick, 21 mm between the lugs.

What is the water resistance of the TUDOR M7941A1A0NU-0001?

TUDOR states the water resistance of reference M7941A1A0NU-0001 as: Waterproof to 200m (660 ft). That figure describes the watch as built, and is not a measurement of any particular used example.

What movement does the TUDOR M7941A1A0NU-0001 use?

The Black Bay M7941A1A0NU-0001 runs the Manufacture Calibre MT5602-U. TUDOR describes it as self-winding mechanical movement with bidirectional rotor system. The stated power reserve is 70-hour power reserve. Certification: COSC and METAS certified (Master Chronometer).

Is the TUDOR M7941A1A0NU-0001 still in production?

TUDOR lists reference M7941A1A0NU-0001 as current. Specifications on this page were read from TUDOR's own documentation on 2026-09-22, and the manufacturer's current documentation governs.

TUDOR · Black Bay

TUDOR Black Bay M7941A1A0NU-0001: specifications and what to check

Name: TUDOR Black Bay 41, steel on bracelet
Brand: TUDOR
SKU: M7941A1A0NU-0001

The Master Chronometer generation of the 41mm Black Bay: METAS-certified MT5602-U, 70-hour power reserve, T-fit clasp, and a case 13.6mm thick. A reference sheet, not a valuation.

Reference M7941A1A0NU-0001 · specifications read from the manufacturer on 2026-09-22 · listed as current

Specifications

As published by TUDOR. A field the manufacturer does not state is left out rather than filled in.

Case: 41mm steel case with polished and satin finish
Diameter: 41 mm
Thickness: 13.6 mm
Lug width: 21 mm
Water resistance: Waterproof to 200m (660 ft)
Crystal: Domed sapphire crystal
Bezel: 60-minute unidirectional bezel in stainless steel with black aluminium insert
Dial: Black, domed, with silver-coloured applied hour markers
Crown: Stainless steel screw-down crown with the TUDOR rose in relief
Bracelet: 3-link stainless steel bracelet with polished and satin finish
Clasp: TUDOR "T-fit" clasp

Movement

Calibre: Manufacture Calibre MT5602-U
Type: Self-winding mechanical movement with bidirectional rotor system
Power reserve: 70-hour power reserve
Certification: COSC and METAS certified (Master Chronometer)
Notes: METAS certification covers precision certified by COSC, waterproofness to 200m under the ISO standard, smooth functioning in a 15,000 gauss magnetic field, and the 70-hour power reserve.

What to check before you buy

Check the T-fit clasp actually adjusts. It is the headline convenience of this generation, and a clasp that has been forced or badly serviced is an expensive part to put right.
Read the bezel action. TUDOR states it is deliberately harder to turn at the 12 o'clock position to prevent inadvertent rotation — a bezel that spins freely there has been apart.
Confirm the calibre against the reference. MT5602-U is the Master Chronometer version; earlier Black Bay generations use different movements, and the caseback and papers should agree with what is inside.
Measure the thickness if the seller describes it as slim. At 13.6mm this is not a thin watch, and a description that suggests otherwise is a signal about the rest of the listing.
Check the lug width before buying straps for it. 21mm is an awkward size and a common source of post-sale complaints.

What this page is, and is not

Every specification below comes from TUDOR's own published product page for this reference, read on the date shown at the top. Nothing here is inferred from what the internet says a watch is worth, and this page carries no valuation of any kind.

That is deliberate. A specification is true for as long as the reference exists. A number about money is stale within weeks and checkable against a dozen sources in seconds, and a single invented one would undermine everything else on this site. If you want that side of it, the max buy calculator works from your own figures.

The generation this is

The MT5602-U is the Master Chronometer movement, which is what separates this from the Black Bays that came before it. METAS certification is not a marketing badge: it covers precision certified by COSC, waterproofness to 200 metres under the ISO standard, correct functioning in a 15,000 gauss magnetic field, and the stated 70-hour power reserve.

For a dealer the practical consequence is that the movement inside should match the reference on the papers. A Black Bay is a long-running family with several distinct calibres across generations, and the description in a listing is not evidence of which one is fitted.

The numbers people get wrong

13.6mm thick. This is a substantial watch. It is routinely described as wearable and occasionally described as slim, and only the first is true.

21mm lug width. Awkward, and worth flagging to a buyer before they discover it. Straps in this size are less common than 20mm or 22mm.

200m water resistance, stated by the maker and covered by the METAS certification rather than asserted loosely.

The T-fit clasp

The on-the-fly adjustment is the headline feature of this generation of bracelet, and it is a mechanism rather than a claim. Work it through its range on inspection. A clasp that has been forced, or serviced by someone unfamiliar with it, is both a noticeable fault to a buyer and a non-trivial part to replace.

The bezel tells you whether it has been apart

TUDOR publishes something genuinely useful here: the unidirectional bezel is deliberately harder to turn when the zero marker sits at 12 o'clock, so that it cannot be knocked out of position by accident.

That is a designed-in behaviour, not a tolerance. A bezel that rotates freely at twelve has been dismantled, reassembled, or worn past its intended state — and on a watch this age that is worth understanding before you agree a price.

Price references like this, faster

What a reference is worth at intake, what to check before you buy it, and where it sells best. Free guides for dealers.

Sources

TUDOR official product page for reference M7941A1A0NU-0001 (Black Bay; 41mm steel case; steel bracelet) - watch specifications as published by Montres TUDOR SA - Case: 41mm steel case with polished and satin finish; Lugs: 21mm lug width; Case thickness: 13.6mm; Waterproofness: waterproof to 200m (660 ft); Bezel: 60-minute unidirectional bezel in stainless steel with black aluminium insert; Dial: black; domed; with silver-coloured applied hour markers; Crystal: domed sapphire crystal; Movement: Manufacture Calibre MT5602-U (COSC and METAS certified); self-winding mechanical movement with bidirectional rotor system; Power Reserve: 70-hour power reserve; Winding Crown: stainless steel screw-down crown with the TUDOR rose in relief; Bracelet: 3-link stainless steel bracelet with polished and satin finish with TUDOR T-fit clasp; the page also states a five-year guarantee and describes METAS Master Chronometer certification as covering precision certified by COSC; waterproofness to 200 m in accordance with ISO standard; smooth functioning when exposed to a magnetic field of 15000 gauss; and a 70-hour power reserve; the unidirectional rotatable bezel rotates in one direction only and is deliberately harder to turn when the zero marker is at 12 o'clock to avoid inadvertent rotation — retrieved 2026-09-22

Not affiliated with TUDOR. Specifications are read from the manufacturer's own published documentation on the date shown and may change; the manufacturer's current documentation governs.